For anyone considering throttle-body injection, this may be a better alternative. Good write-up in the latest Chevy High Performance on the Mass-Flo EFI system. Minimal hassle install, too!
http://www.mass-floefi.com/mass-flo.html
Colin, maybe you could drop that 350 back in your Vega with a carb and get it back on the road then do this conversion later if you still want EFI.
I'd strongly consider this if I do a V-8 swap on the Sunbird!
Later,
Dave